so many stars coming together for the victims of sandy. there's paul mccartney playing with nirvana. we'll have a lot more of the amazing show right there. hello to robin at home. great to have amy robach here. and rachel smith is in for lara today. >>> and we have some chilling, new details about the gunman behind that horrifying shooting at the oregon mall. his ex-girlfriend is now speaking out, saying his behavior changed dramatically the week before the shooting. >>> we have video we couldn't stop watching. here is why. 10-month-old babies learning to swim, obviously, before they can walk. we sent our correspondent, lama hasan, to learn the secrets of the pool. blissful and wonderful. >>> and love listening to this right here. ♪ music can mean only one thing. jerry seinfeld is here this morning. >>> but right now, let's get to the news. >>> the chopper went down at north island air station as what's being described as a routine training session. all four crew members onboard did survive the crash. they were rushed to various local ho